GB445935A - An improved sound reproducing device - Google Patents

An improved sound reproducing device

Info

Publication number
GB445935A
GB445935A GB2966534A GB2966534A GB445935A GB 445935 A GB445935 A GB 445935A GB 2966534 A GB2966534 A GB 2966534A GB 2966534 A GB2966534 A GB 2966534A GB 445935 A GB445935 A GB 445935A
Authority
GB
United Kingdom
Prior art keywords
diaphragms
coils
gaps
polepiece
centre
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2966534A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ALFRED SIDNEY EVANS
Original Assignee
ALFRED SIDNEY EVANS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ALFRED SIDNEY EVANS filed Critical ALFRED SIDNEY EVANS
Priority to GB2966534A priority Critical patent/GB445935A/en
Publication of GB445935A publication Critical patent/GB445935A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

445,935. Loud-speakers. EVANS, A. S., 53, Maldon Road, Edmonton, London. Oct. 17, 1934, No. 29665. [Class 40 (iv)] In an electrical sound - reproducing device having two or more moving coils 5, 5<a>, 5<b> mounted in separate air gaps 4, 4<a>, 4b and individually associated with diaphragms 6, 6<a>, 6b having different sound - reproducing characteristics, the diaphragms are independently mounted on the magnet and the gaps are formed between the centre polepiece 2 and the body 1 of the magnet so that the coils are cut in series by the same lines of magnetic force in one and the same magnetic circuit. As shown, the gaps 4, 4<a>, 4b are formed between soft-iron rings 7, 7<a> mounted on the centre polepiece 2 by a non-magnetic support 8 and the polepieces 1, 2. One of the diaphragms may co-operate with a horn, Fig. 2 (not shown), and the coils with their associated diaphragms may be mounted at the opposite ends of the centre polepiece. In the latter case a horn associated with the smaller diaphragm may be formed by a shaped axial channel in the centre polepiece, Fig. 4 (not shown).
GB2966534A 1934-10-17 1934-10-17 An improved sound reproducing device Expired GB445935A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2966534A GB445935A (en) 1934-10-17 1934-10-17 An improved sound reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2966534A GB445935A (en) 1934-10-17 1934-10-17 An improved sound reproducing device

Publications (1)

Publication Number Publication Date
GB445935A true GB445935A (en) 1936-04-17

Family

ID=10295158

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2966534A Expired GB445935A (en) 1934-10-17 1934-10-17 An improved sound reproducing device

Country Status (1)

Country Link
GB (1) GB445935A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496589A (en) * 1945-05-08 1950-02-07 Operadio Mfg Co Double diaphragm loud-speaker
DE1002396B (en) * 1954-03-05 1957-02-14 Goodmans Ind Ltd Coaxial loudspeaker
DE1040605B (en) * 1954-11-08 1958-10-09 Goodmans Ind Ltd Sound playback device, in particular dynamic loudspeakers or the like.
GB2153628A (en) * 1984-01-27 1985-08-21 Tannoy Ltd Moving coil loudspeaker
GB2250658A (en) * 1990-12-07 1992-06-10 Canon Res Ct Europe Ltd Loudspeaker
GB2261135A (en) * 1991-11-02 1993-05-05 Meir Mordechai A loudspeaker
US5418336A (en) * 1990-10-17 1995-05-23 Canon Research Centre Europe Ltd. Sound output device
GB2334849A (en) * 1998-02-27 1999-09-01 Simon James Norfolk The double diaphragm loudspeaker

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496589A (en) * 1945-05-08 1950-02-07 Operadio Mfg Co Double diaphragm loud-speaker
DE1002396B (en) * 1954-03-05 1957-02-14 Goodmans Ind Ltd Coaxial loudspeaker
DE1040605B (en) * 1954-11-08 1958-10-09 Goodmans Ind Ltd Sound playback device, in particular dynamic loudspeakers or the like.
GB2153628A (en) * 1984-01-27 1985-08-21 Tannoy Ltd Moving coil loudspeaker
US5418336A (en) * 1990-10-17 1995-05-23 Canon Research Centre Europe Ltd. Sound output device
GB2250658A (en) * 1990-12-07 1992-06-10 Canon Res Ct Europe Ltd Loudspeaker
GB2261135A (en) * 1991-11-02 1993-05-05 Meir Mordechai A loudspeaker
GB2334849A (en) * 1998-02-27 1999-09-01 Simon James Norfolk The double diaphragm loudspeaker
GB2334849B (en) * 1998-02-27 2001-02-28 Simon James Norfolk The double diaphragm

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